@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;500;600;700&family=Public+Sans:wght@400;500;600;700&display=swap');

/* ==========================================================================
   Design Tokens (Variables CSS)
   ========================================================================== */
:root {
  /* Colors - Light Theme (Default) */
  --color-primary: #1B5E3F;
  --color-primary-hover: #134A30;
  --color-accent: #C8862B;
  --color-accent-hover: #B07421;
  --color-accent-light: #3FA66A;
  
  --color-bg: #FAF7F0;
  --color-text: #1C2421;
  --color-text-muted: #4A5D54;
  --color-surface: #FFFFFF;
  --color-border: #DBCFBE;

  /* Typography */
  --font-heading: 'Fraunces', serif;
  --font-body: 'Public Sans', sans-serif;

  /* Spacing */
  --space-4: 0.25rem; /* 4px */
  --space-8: 0.5rem;  /* 8px */
  --space-12: 0.75rem;/* 12px */
  --space-16: 1rem;   /* 16px */
  --space-24: 1.5rem; /* 24px */
  --space-32: 2rem;   /* 32px */
  --space-48: 3rem;   /* 48px */
  --space-64: 4rem;   /* 64px */

  /* Borders & Shadows */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-pill: 9999px;
  --shadow-sm: 0 2px 4px rgba(28, 36, 33, 0.05);
  --shadow-md: 0 4px 8px rgba(28, 36, 33, 0.1);
  --shadow-lg: 0 8px 24px rgba(28, 36, 33, 0.15);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

/* Dark Theme */
[data-theme="dark"] {
  --color-bg: #11201A;
  --color-text: #EDF3EF;
  --color-text-muted: #A3B5AB;
  --color-surface: #1E3128;
  --color-border: #2D4337;
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   CSS Reset & Base
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
  font-weight: 600;
  margin-bottom: var(--space-16);
  color: var(--color-primary);
}

[data-theme="dark"] h1, 
[data-theme="dark"] h2, 
[data-theme="dark"] h3, 
[data-theme="dark"] h4, 
[data-theme="dark"] h5, 
[data-theme="dark"] h6 {
  color: var(--color-accent-light);
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 0.1em;
  text-underline-offset: 0.2em;
  transition: color var(--transition-fast);
}

[data-theme="dark"] a {
  color: var(--color-accent-light);
}

a:hover {
  color: var(--color-primary-hover);
}

[data-theme="dark"] a:hover {
  color: var(--color-accent);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style-position: inside;
}

/* Accessibility: Focus visible */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* Skip link (Accessibility) */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-8) var(--space-16);
  z-index: 1000;
  transition: top var(--transition-fast);
  text-decoration: none;
  font-weight: 600;
}
.skip-link:focus {
  top: 0;
}

/* ==========================================================================
   Utility Classes & Components
   ========================================================================== */

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-24);
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--space-24);
}
@media (min-width: 768px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(3, 1fr); gap: var(--space-32); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

/* Visually Hidden */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-12) var(--space-24);
  font-family: var(--font-body);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  line-height: 1;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.btn:active {
  transform: translateY(0);
}

.btn--primary {
  background-color: var(--color-primary);
  color: #ffffff !important;
}
.btn--primary:hover {
  background-color: var(--color-primary-hover);
  color: #ffffff !important;
}
[data-theme="dark"] .btn--primary {
  background-color: #ffffff;
  color: var(--color-primary) !important;
}
[data-theme="dark"] .btn--primary:hover {
  background-color: var(--color-bg);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-primary) !important;
  border-color: var(--color-primary);
}
.btn--ghost:hover {
  background-color: var(--color-primary);
  color: #ffffff !important;
}
[data-theme="dark"] .btn--ghost {
  color: var(--color-accent-light) !important;
  border-color: var(--color-accent-light);
}
[data-theme="dark"] .btn--ghost:hover {
  background-color: var(--color-accent-light);
  color: #11201A !important;
}

/* Cards */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-24);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}
.card:hover, .card:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent);
}
.card__title {
  margin-bottom: var(--space-12);
  font-size: 1.25rem;
}

/* Tags */
.tag {
  display: inline-block;
  padding: var(--space-4) var(--space-12);
  background-color: var(--color-accent-light);
  color: #FFFFFF;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
[data-theme="dark"] .tag {
  background-color: var(--color-accent);
}